#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

string s, t;
bool solve() {
  int n = s.size();
  int m = t.size();
  int i = 0;
  rep(j, 0, m - 1) {
    if (i >= n) break;
    if (s[i] == t[j]) i++;
  }
  return i == n;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  while (cin >> s >> t) {
    cout << (solve() ? "Yes" : "No");
    cout << endl;
  }
  return 0;
}